Large fluctuation of vortex flowmeter | Analysis of several fault causes of vortex flowmeter

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1. How to solve the problem of excessive range displayed by a vortex flowmeter? The core solution to the problem of excessive range displayed by a vortex flowmeter is to first investigate the cause of the excess range and then take targeted measures, which can be divided into two directions: rapid emergency and radical solutions. 1. Step 1: Quickly determine the type of overrange. You can distinguish it by the alarm prompt and output signal range of the flowmeter: - Positive overrange: The measured value is higher than the maximum range limit of the flowmeter, which is common in situations where the actual flow rate is too large or the signal acquisition is abnormal. - Negative overrange: The measured value is below the lower limit of the range and imitates, often resulting in negative values and zero drift when there is no flow Specific solution based on different scenarios 2.1 Actual flow exceeding the rated range of the flow meter is the most common reason, and there are two ways to deal with it: - Temporary emergency: temporarily reduce the medium flow in the pipeline to bring the measured value back within the range, avoiding hardware overload damage to the flow meter - Radical solution: replace with a larger range of vortex street flow meters, and reserve more than 30% margin when selecting. For example, if the actual peak flow rate is 100m ³/h, 130-150m ³/h should be selected Range model - Supplementary operation: If the flow rate fluctuation is too large under working conditions, a throttle orifice plate or flow control valve can be installed to stabilize the medium flow rate entering the flowmeter. 2.2 Error in instrument parameter setting - Check range setting: Enter the flowmeter parameter menu and confirm whether the current set range upper limit matches the actual working conditions. Some misoperation may cause the range to be set too small, resulting in display exceeding the range. - Calibrate zero point: When there is no medium flow, perform zero point calibration operation to eliminate zero point offset caused by installation tilt or medium residue. - Reset instrument: If the parameters are chaotic, reset the range, medium type, temperature and pressure compensation parameters after restoring the factory settings. 2.3 Signal transmission or external interference problems - Check wiring: Confirm that the sensor signal line and power line are firmly wired, without looseness or short circuit. The sentence is:, Avoid interference signal mixing - Investigate electromagnetic interference: Keep away from strong electromagnetic sources such as frequency converters, high-power motors, and high-voltage cables. If necessary, install signal shielding wires - Replace sensors: If the sensor probe is damaged by medium corrosion or scaling, it will cause signal distortion and false out of range display, and the same model probe needs to be replaced. 2.4 Abnormal medium working conditions - Check medium parameters: If the medium temperature and pressure fluctuate significantly beyond the compensation range of the flowmeter, it will cause the calculated flow value to exceed the range, and the medium working conditions need to be adjusted to the allowable range of the instrument - Clean the pipeline: If there are impurities or bubbles blocking the pipeline, it will cause local flow rate changes and trigger an out of range alarm, and the pipeline impurities need to be cleaned regularly. 3 Safety precautions: During inspection and mainte

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